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- Title
Excitation‐Dependent Emission Color Tuning of 0D Cs<sub>2</sub>InBr<sub>5</sub>·H<sub>2</sub>O at High Pressure.
- Authors
Li, Qian; Xu, Bin; Chen, Zhongwei; Han, Jiang; Tan, Li; Luo, Zhishan; Shen, Pengfei; Quan, Zewei
- Abstract
Self‐trapped exciton (STE) emission of low‐dimensional metal halides has witnessed explosive developments in both display and illumination, due to its intriguing photoluminescence properties. As one typical feature, STE emission energy is commonly independent of excitation wavelength. Herein, a rare phenomenon of inverse excitation‐dependent dual‐band emission is achieved on 0D Cs2InBr5·H2O. Under initial compression, the contraction of inhomogeneously coordinated InBr5O octahedra gives rise to blue‐shifted STE emission with the decreased Stokes shift. As the phase transition occurs under higher pressure, considerable octahedral distortions generate a new defect‐related localized exciton emission. Notably, the high‐energy emission from the intrinsic STE state is only observed under the low‐energy excitation, which is believed to originate from the excitation‐dependent multiple excited states in high‐pressure Cs2InBr5·H2O.
- Subjects
METAL halides; STOKES shift; EXCITED states; PHASE transitions; OCTAHEDRA; CESIUM compounds
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 38, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202104923